PortableApps in Windows Vista

i have problems with autorun in vista...

i use the PA in a pendrive and in XP it ask how i want to open the pendrive... ok

in vista, before the installation of PA too but after, it says my pendrive have problems and it ask to me if i want to correct the problems, but when i say yes, it dont find nothing! after that, it ask again... if i say no and open the drive by explorer it works perfectly and dont have any problem!

i formatted my pendrive but this sill happening. only after install of portable apps... and only in vista!

i dont send a screenshot because my system is in portuguese and the messeges will not be usefull...

other thing: how i do to make the PA the default and not ask all times? i tried by the same form of other things like CD but PA is not in the list... (need this in XP and Vista)

thanks!